Martell (formerly Oneida) is a census-designated place in Amador County, California, United States. It is located 1.5 miles (2.4 km) northwest of Jackson, at an elevation of 1486 feet (453 m). The population was 282 at the 2010 census.
Martell is located west of Jackson and east of Ione, by which it is connected by the Amador Central Railroad. Martell is where the major retail outlets for Amador County are located, including Kmart, Wal-Mart, Safeway and Lowe's in a shopping center. McDonald's, Burger King, Starbucks, Baskin-Robbins, Jack in the Box and Subway are restaurant chains in town. The community is in ZIP code 95654 and area code 209.